Unload inactive tabs to save system memory in Firefox

Tab Unloading is a new feature that helps reduce memory usage by unloading tabs that you are not actively using. To avoid crashes, Firefox will automatically select and unload these open tabs when the system's memory is low, starting in Firefox version 93 on Windows. This is a smart process that avoids unloading tabs that are playing media, using Picture-in-Picture, or WebRTC. For more technical information, see this blog post.

The about:unloads page, built into Firefox 94 for all Desktop platforms, will show you information about the order of priority of your open tabs, the memory each tab is consuming, and the last time you accessed each tab. To access this configuration, type about:unloads in the address bar and press Enter.

You can manually unload your least-recently-used tabs by going to the about:unloads page and clicking on the Unload button that appears above the table, on the right.